Edward Horsford takes photographs of water balloons being popped. The results create the impression of water hanging in midair:

"My camera is really the least important part of the shots," Horsford writes in an e-mail. The trick seems to be in the timing of the flash. He sets a timer on his camera to take a long exposure of 1 to 2 seconds, and if the flash fires within that time, he gets an image. He uses a special gizmo with a microphone that triggers the flashes when it picks up a certain level of sound (i.e., the pop of a balloon).